首页|Effect of the anionic composition of sulfolane based electrolytes on the performances of lithium-sulfur batteries
Effect of the anionic composition of sulfolane based electrolytes on the performances of lithium-sulfur batteries
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In lithium-sulfur batteries,cell design,specifically electrolyte design,has a key impact on the battery per-formance.The effect of lithium salt anion donor number(DN)(DN[PF6]-=2.5,DN[N(SO2CF3)2]-=5.4,DN[ClO4]-=8.4,DN[SO3CF3]-=16.9,and DN[NO3]-=21.1)on the patterns of lithium-sulfur batteries and lithium metal electrode performances with sulfolane-based electrolytes is investigated.An increase in DN of lithium salt anions leads to an increase in the depth and rate of electrochemical reduction of sulfur and long-chain lithium polysulfides and to a decrease in those for medium-and short-chain lithium polysul-fides.DN of lithium salt anions has weak effect on the discharge capacity of lithium-sulfur batteries and the Coulomb efficiency during cycling,with the exception of LiSO3CF3 and LiNO3.An increase in DN of lithium salt anions leads to an increase in the cycling duration of lithium metal anodes and to a decrease in the presence of lithium polysulfides.In sulfolane solutions of LiNO3 and LiSO3CF3,lithium polysulfides do not affect the cycling duration of lithium metal anodes.
Donor numberLithium saltSulfolaneLithium polysulfideElectrolyteLithium-sulfur batteryLithium metal electrode
Elena V.Karaseva、Elena V.Kuzmina、Bo-Quan Li、Qiang Zhang、Vladimir S.Kolosnitsyn
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Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Science,71,Prospect Oktyabrya,Ufa 450054,Bashkortostan,Russia
Advanced Research Instituteof Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China
Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China
Russian Science Foundation as part of joint project of RSF-NSFCNational Natural Science Foundation of China
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